What eastern European border was disputed between it's two nations after World War I, was re-established in 1990 as an identical version of its former self, changed only in the name of one of it's nations?
Lithuania–Poland border
-1
Section::::Abstract.
Suwałki Region
1794481
-1
Section::::Abstract.
Suwałki Region
1794481
-1
Section::::Abstract.
Lithuania–Poland border
45665692
-1
Section::::Abstract.
Lithuania–Poland border
45665692